Sound-box with coupled diaphragms for disk talking-machines.



1%. 828,309. P-FATENTED wet-14, 1906?? L. GARDY.

8613K BOX WITH COUPLED DIAPHRAGMS FOR DISKIALKING MACHINES.

-' ,Jrrmoumn FILED novpzg, 1905. I

I 4 Id'wnerit may /ittamey also be used as recorder.

transmit the vibrations.

' rr srarns PATENT; ornron.

LAURENT GARDY, 0F PERIjfIGNANQFRANCE. SOUND-BOX WITH COUPLED DIAPHRAGMSFOR DISK-TALKlNG -MACHIN E'S.

No. saasoe.

Specification of Letters Patent.

' ramming. 14, 1906.

Application filed November 2Q, '.i905.' Serial No 289,653.

,To all whom it may concern.- Be it known that I, LAURENT GARDY, acitizen of France, residing at 5 Rue de-la Fusterie, Perpignan,Pyrnes-Orientales, France, have invented new and useful Improvements inSound-Boxes with Coupled Diaphragms for Disk Talking-Machines, of whichthe following is a specification. i This'invention has for its object asoundbox tor disl; talking-machines in which two vibrating diaphragmsarranged oppositeeach other are directly'connected to a singlepin-holderplaced between them. By such a construction a double reproduction intwo,

distinct horns or an amplified reproduction in one same horn can beobtained, as will be hereinafter explained. The same device can In theannexed drawings, Figurel is a longitudinal section of a formof'co'nstructionof the sound-box with coupled diaphragms. Fig; 2 is aside view of] the sound-box. vFig. 3 is a longitudinal section of aslightlyrmoditied construction, and Fig. 4 shows the do vice by means ofwhich a single horn can be.

employed in connection with the sound-box with coupled diaphragms. Y

Referring to Fig. 1 of the drawings, it will be seen that two ordinarysingle boxes at and b are coupled in such a manner that their vibratingdiaphragms m and m are placed opposite each other. These boxes aresecured to each other by their periphery in a certain number of points,but in- 'such a way as to leave the space between the two dia-' phragmsin direct connectionwith the outside air. A pin-holder c is mounted onthe wall of the whole thus formed and-is extended between the twodiaphragms by a yoke, the branches '(Z and d of which are properlyseparated in order to be fixed, respectively,

The air-chamher. behind each diaphragm is extended, as usually, by atubulure t or 25, adapted to Themounting of the pin-holder on the wallof the apparatus is assured in the following manner: On a flat portion 1of the metallic fram'e of the apparatus are provided twoV-shaped proections 2 and 3 and two til-shaped notches -and 5. y

their sharp ends, respectively, wit

notches 4 and 5 and with the notches on the lower face of the crossbar-cand by means of ters Patent, is.

each other, two parallel vibrating di The cross-bar 0, made integralwith the pinholder 0, has in turntwo V-shaped notches-.-

on its lowervface and two V-shaped' notches on its upper face.The'cross-bar is placed in such'a manner that the notches ofthelowerface are astride with the projections 2 and 3, and the inhold'er is, secured in'position by means 0 two yoke-hoops 6 and 7, enagiililg' t e two screws 8 and 9, which wedge. the yokehoo s-by'beingscrewed into'the fiat portion 1 o the frame. By this way of mounting thepin-holderv the latter is held tightly,

though a certain movableness is afforded thereto and-it can be veryeasily removed. In the form shown in Fig.

0, instead of being extende by a yoke, is terminated in a branch fthrough the end of which passes a thin rod g, secured by the middle tosaid branch andby its ends to the diaphragms .m and m, respectively. Therest of t e construction is not altered.

It will'be understood that in either case when the in 0.moves along thegrooves of a recorded isk it will transmit to the two diaphra grns n andm" simultaneous and concpi; rent vibrations, which 'may be received intwo horns, respectively, connected to the tubulurest and t. v If it isdesired to. obtain a reproduction in only one of the horns, it will onlybe needed to connect the two tubulures', tv 15; by means of a C-shapedconduit Z and to join the middle part of said conduit provided with anopening to the nozzle of a single horn. Having-now described myinvention, what. I claim as new, and desire'to secure by Let- Asound-box comprising two metallic boxes, means for se curing these boxestogether and opposite to phragms' fixed respectively in each box,i.pin-holder placed betwe'en 'the two di phragms, means for connectingsaidflpi for disk talking-machines,

3 the pin-holder holder toeach diaphragm, an exterior cros bar made interal with the pin-holder,

notches provide in said cross-bar, projec- LOO .' tions and notchesprovided in the metallic frame, two yoke-hoops resting on the crossbarend on the metallic frame, and. two

screws wedging the said yoke-hoops by being 5 screwed into said metallicframe, substan- Eia-lly as described and for the purpose set orth.

' In testimony whereof I have signed my name to this specification inthe-presence of two subscribir'ig witnesses.

v vL'iA'rUR'ENl. GARDY. Witnesses:

H. ALIN, A. W. BRANN.

